Actually, there are image converters for Windows OS that you may use without any limitations and entirely offline. The
Softaken Image Converter Software is one solution. PNG, JPG, TIFF, GIF, BMP, ICO, and WebP are among the formats it supports; it is not reliant on the internet and has no restrictions on the quantity of conversions it may perform. Bulk image conversion is also possible while maintaining picture quality and folder structure. There are no restrictions on file sizes or upload times because it is designed to be a desktop utility. It functions well on all Windows versions and includes a free sample so you can test out the features and final product before buying.